Return err message with 422 exception

~dev_rating/application/classes/Controller/Handler.php

@@ -26,7 +26,7 @@ class Controller_Handler extends Controller
         return $res;
     }
     
-    protected function fail() {
-        throw HTTP_Exception::factory(422)->request($this->request);
+    protected function fail($message = null) {
+        throw HTTP_Exception::factory(422, $message)->request($this->request);
     }
 }

~dev_rating/system/classes/Kohana/HTTP/Exception/Expected.php

@@ -35,6 +35,9 @@ abstract class Kohana_HTTP_Exception_Expected extends HTTP_Exception {
 		// Prepare our response object and set the correct status code.
 		$this->_response = Response::factory()
 			->status($this->_code);
+        
+        if (!is_null($message))
+            $this->_response->body($message);
 	}
 
 	/**

~dev_rating/system/classes/Kohana/Response.php

@@ -196,7 +196,7 @@ class Kohana_Response implements HTTP_Response {
 	 *      $status = $response->status();
 	 *
 	 * @param   integer  $status Status to set to this response
-	 * @return  mixed
+	 * @return  self|mixed
 	 */
 	public function status($status = NULL)
 	{